In a study of the effectiveness of a treatment for depression, a psychologist assessed patients' symptoms of depression using a reliable questionnaire both before and for several months after treatment. The results indicated that the patients experienced a decrease in their symptoms over the 8-month time period of the study. One threat to internal validity the researcher should consider is
A. maturation.
B. regression.
C. testing.
D. all of these
D. all of these
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The rules governing proper use of words, phrases, and sentences to convey meaning are called
a. language. b. grammar. c. syntax. d. semantics. e. linguistics.
Cells in the prefrontal cortex, premotor cortex, and ____ prepare for a movement, sending messages to the primary motor cortex
a. posterior parietal cortex b. secondary motor cortex c. somatosensory cortex d. supplementary motor cortex
In a comprehensive headache treatment program, people who were low users of analgesic medications achieved at least a ____ percent reduction in headache pain
a. 25 b. 50 c. 75 d. 99
Events that cause a stress reaction are referred to as
a. hassles. b. catastrophies. c. eustresses. d. stressors. e. MLEs.